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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Held to Maturity
Amortized Cost	$ 266,608	$ 69,102
Gross Unrealized Gains	260	1,251
Gross Unrealized Losses	(17,085)	(244)
Estimated Fair Value	249,783	70,109
Available for Sale
Total	42,309	63,080
Gross Unrealized Gains		210
Gross Unrealized Losses		114
Estimated Fair Value		63,176
U.S. agency securities
Held to Maturity
Amortized Cost	170,676	28,760
Gross Unrealized Gains	11	8
Gross Unrealized Losses	(12,109)	(99)
Estimated Fair Value	158,578	28,669
Mortgage-backed securities, U.S. government agencies
Held to Maturity
Amortized Cost	43,995	25,913
Gross Unrealized Gains	4	936
Gross Unrealized Losses	(2,486)	(122)
Estimated Fair Value	41,513	26,727
Available for Sale
Total	42,309	63,080
Gross Unrealized Gains	0	210
Gross Unrealized Losses	894	114
Estimated Fair Value	41,415	63,176
Mortgage-backed securities, Private label residential
Held to Maturity
Amortized Cost	49,335	13,929
Gross Unrealized Gains	245	302
Gross Unrealized Losses	(2,392)	(23)
Estimated Fair Value	47,188	14,208
Taxable municipal securities
Held to Maturity
Amortized Cost	2,102
Gross Unrealized Gains	0
Gross Unrealized Losses	(67)
Estimated Fair Value	2,035
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	500	500
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(31)	0
Estimated Fair Value	$ 469	$ 505

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